Test Details

Synonyms

Use

Methodology

Related Documents

Specimen Requirements

Specimen

Serum or plasma

Serum or plasma

Volume

1 mL

1 mL

Minimum Volume

0.3 mL

0.3 mL

Container

Red-top tube or green-top (heparin) tube. Do not use a gel-barrier tube. The use of gel-barrier tubes is not recommended due to slow absorption of the drug by the gel. Depending on the specimen volume and storage time, the decrease in drug level due to absorption may be clinically significant.

Red-top tube or green-top (heparin) tube. Do not use a gel-barrier tube. The use of gel-barrier tubes is not recommended due to slow absorption of the drug by the gel. Depending on the specimen volume and storage time, the decrease in drug level due to absorption may be clinically significant.

Collection

Transfer separated serum or plasma to a plastic transport tube. Trough concentrations should be monitored. The trough sample is drawn immediately prior to the next dose.

Transfer separated serum or plasma to a plastic transport tube. Trough concentrations should be monitored. The trough sample is drawn immediately prior to the next dose.

Storage Instructions

Refrigerate

Refrigerate

Stability Requirements

Temperature

Period

Room temperature

3 days

Refrigerated

14 days

Frozen

14 days

Freeze/thaw cycles

Stable x3

Causes for Rejection

Gel-barrier tube; hemolysis; lipemia; gross bacterial contamination

Gel-barrier tube; hemolysis; lipemia; gross bacterial contamination

Clinical Information

Special Instructions

Peak levels should be ordered using test 070327. Trough levels should be ordered using test 070328. Peak and trough levels may be ordered together as a profile on the same request form using test 717314. Please label tubes appropriately as “peak” and “trough.”